The agroecological zone model proposed by FAO (ZAE/FAO) is an important tool in agricultural planning and can be used in Jataí, which has been gaining space in the production of sugarcane. The objective of this study was to compare the observed meteorological databases (BDMEP) with the estimated ones (Xavier and NASA POWER), in the estimation of potential productivity (PP) and attainable (PA) of sugarcane and its penalties for management (PMJ) and water deficit (PDF), using the ZAE/FAO model in the municipality of Jataí - GO. To this end, the BDMEP, Xavier and NASA POWER database, 33 years old (1984-2017), were used. Using BDMEP, Xavier and NASA POWER as input in the ZAE model, we observed an average PP of 259±11, 275±10 and 267±11 Mg ha-1 as, respectively. PA reaches 200 Mg ha-1 when using BDMEP in ZAE, with 50% of the crop year with PA above 180 Mg ha-1.  There was an average penalty of 114.01±6.9 for management and 85.67±4.08 Mg ha-1 in stem yield. The meteorological variables of Xavier's database can be used in the ZAE model in the prediction of productivity penalty for water deficit and sugarcane management, with 63% and 88% adjustment to BDMEP, respectively. NASA POWER can be used in the simulation of penalty for failures in sugarcane management, with up to 87% approximation of those observed. Both sources when used in the prediction model assist in agricultural planning.

Resposta de parâmetros morfológicos de cultivares de cenoura no vale do gurgueia, Piauí Response of morphological parametrs of carrot cultivars in the gurgueia valley, Piauí

As brássicas possuem alta exigência em boro. O suprimento inadequado deste micronutriente pode limitar a sua produção, principalmente devido à baixa disponibilidade do elemento em determinados tipos de solos. Isso porque este elemento contribui na incorporação de cálcio na parede celular e diretamente no processo de expansão celular, tendo atuação também direta no crescimento e desenvolvimento dessas hortaliças. Assim, objetivou-se nesse trabalho, avaliar a produção de repolho em condições semiáridas no Sul do Piauí, utilizando diferentes doses de ácido bórico. O experimento foi conduzido no Setor de Horticultura do Campus Professora Cinobelina Elvas, da Universidade Federal do Piauí, no Município de Bom Jesus – PI no período de fevereiro a junho de 2012. O delineamento experimental utilizado foi em blocos casualizados, cujos tratamentos foram compostos por cinco doses de boro (0, 2, 4, 6 e 8 kg ha-1) e quatro repetições. Foram avaliadas as seguintes variáveis: altura de planta, circunferência da cabeça, área foliar, massa média da cabeça, produtividade, concentração de boro no solo e teores de boro na cabeça e folhas. As doses de boro aplicadas foram significativas para a circunferência da cabeça, massa média da cabeça, teor de boro nas folhas e produtividade. E não apresentaram efeito significativos nas variáveis altura da planta, área foliar, concentração de boro no solo e teor de boro na cabeça. Para incrementar a qualidade das cabeças é necessário uma maior demanda de boro, pois foi obtido máximos valores para circunferência da cabeça (54,65 cm) e da massa média da cabeça (1,41 kg) com a aplicação de 4,39 e 4,35 kg ha-1 de boro. Enquanto a produtividade máxima de 68, 56 t ha-1 de repolho foi obtida com 3,89 kg ha-1 de boro. Nas condições semiáridas do Sul do Piauí, a produtividade e a qualidade do repolho, é alcançada com aplicação de 4,0 a 4,5 kg ha-1 de boro no solo. Palavras-chave: Brassica oleracea var. capitata; ácido bórico; nutrição mineral; rendimento.   Production of cabbage under the influence of boron   ABSTRACT: Brassica has a high demand for boron. The inadequate supply of this micronutrient can limit its production, mainly due to the low availability of the element in certain types of soils. This is because this element contributes to the incorporation of calcium in the cell wall and directly in the cell expansion process, having a direct role in the growth and development of these vegetables. Thus, the objective of this work was to evaluate the production of cabbage in semi-arid conditions in southern Piauí, using different doses of boric acid. The experiment was carried out in the Horticulture Sector of the Professora Cinobelina Elvas Campus, at the Federal University of Piauí, in the municipality of Bom Jesus - PI from February to June 2012. The experimental design used was in randomized blocks, whose treatments were composed by five doses of boron (0, 2, 4, 6 and 8 kg ha-1) and four repetitions. The following variables were evaluated: plant height, head circumference, leaf area, average head mass, productivity, boron concentration in the soil and boron levels in the head and leaves. The applied boron doses were significant for the head circumference, average head mass, boron content in the leaves and productivity. And they have no significant effect on the variables plant height, leaf area, boron concentration in the soil and boron content on the head. To increase the quality of the heads, a greater demand for boron is necessary, as maximum values for head circumference (54.65 cm) and average head mass (1.41 kg) were obtained with the application of 4.39 and 4.35 kg ha-1 of boron. While the maximum productivity of 68.56 t ha-1 of cabbage was obtained with 3.89 kg ha-1 of boron. In the semi-arid conditions of southern Piauí, the productivity and quality of the cabbage is achieved with the application of 4.0 to 4.5 kg ha-1 of boron in the soil. Keywords: Brassica oleracea var. capitata; boric acid; mineral nutrition; yield.

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